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x = 180° - y
x² - y² = - 8/9 π²
(180° - y)² - y² = - 8/9 . (180°)²
(180°)² - 360°.y + y² - y² = - 8/9 (180°)²
(180°)² - 360° y = - 8/9 (180°)²
- 360°y = - 8/9.(180°)² - (180°)²
- 360°y = - 17/9 (180°)²
360°y = 17 . 20° . 180°
y = 17 . 20° . 180° / 360°
y = 17 . 10
y = 170°
q = 180° - y ... (saling berpelurus)
q = 180° - 170°
q = 10°
soal no. 15 tak terbaca (gk ada)